Home
Back
Generator Wattage Formula:
| From: | To: |
The generator wattage calculation determines the appropriate size of a generator needed to power all electrical loads in a home with a safety margin. It ensures the generator can handle the total load plus a buffer for startup surges and future additions.
The calculator uses the generator sizing formula:
Where:
Explanation: The safety factor ensures the generator isn't overloaded by accounting for motor startup currents and provides capacity for future electrical needs.
Details: Proper generator sizing prevents overload conditions, ensures reliable operation during power outages, and extends the generator's lifespan by avoiding continuous operation at maximum capacity.
Tips: First calculate the sum of all electrical loads you plan to power. Then select an appropriate safety factor (1.35 is typically recommended). The calculator will determine the minimum generator size required.
Q1: Why is a safety factor needed?
A: Electrical motors require 3-7 times their running wattage to start. The safety factor accounts for these startup surges and provides headroom for future additions.
Q2: What's the difference between running and starting watts?
A: Running watts are the continuous power needed, while starting watts are the temporary surge needed to start motors (like in refrigerators or AC units).
Q3: How do I calculate my total load wattage?
A: Add up the wattage of all appliances you want to run simultaneously. Check appliance labels or manuals for wattage information.
Q4: What happens if I undersize my generator?
A: An undersized generator may trip circuit breakers, fail to start motors, or be damaged from continuous overloading.
Q5: Can I use this for whole-house generators?
A: Yes, this calculation works for both portable and whole-house standby generators. For whole-house systems, consider consulting an electrician.